Artak Hambarian

Artak Hambarian

Lives in Armenia Yerevan, Armenia
Works as a Professor
Joined on Jan 3, 2009
About me:

Architecture, Energy, Environment, Beauty

Comments

Total: 60, showing: 1 – 20
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On Manfrotto introduces new lens filter lineup article (125 comments in total)
In reply to:

yonsarh: I only use filter when using expensive lenses, but for lenses under 500$ or 300$, I don't use filter. If it is high quality lens, lens protection is needed. I don't use lens hood because of vignetting.

Lens hoods are not annoying. They are beautiful. They are protective. I have dropped my camera on ice, i dropped miself too, the strike came to the lens hood that crashed, no damage to the lens...

Direct link | Posted on Nov 9, 2014 at 06:55 UTC
In reply to:

falconeyes: DPR could have done a much better job when reporting this.

Let me fill in the missing facts:

1. 0.005 lux is -9 EV (almost exactly). The scene is pitch black dark indeed.

2. However, to judge the sensor, an EV figure w/o aperture and exposure time is meaningless.

3. According to Sony, it is F1.4, 1/60s exposure. -9 EV then requires ISO 6,000,000 to expose correctly. I.e., the image shown is ISO 6m.

4. That's 3.9 stop beyond e.g., the A7s highest iso level of 410k. But the image quality shown by Sony for a tiny 400x300 pixel image is terrible. While the A7s is still ok at 410k.

Therefore, no conclusion that this chip would be more sensitive than other sensors can be drawn from matrerial provided. Just marketing non info.

And btw, at quantum efficiencies already as high as 65% and read noise as low as 0.4 e- (A7s) rest assured that no miracles are left in this field if you cannot break the laws of nature.

HowaboutRAW: it seems you are a curious individual. Keep being curious. However focusing on a statement that you do not clearly understand, is not so good for you. Existance of flash memory cannot in any way question quantum mechanics. Where from have you taken this false statement?

Direct link | Posted on Oct 22, 2014 at 21:45 UTC
In reply to:

falconeyes: DPR could have done a much better job when reporting this.

Let me fill in the missing facts:

1. 0.005 lux is -9 EV (almost exactly). The scene is pitch black dark indeed.

2. However, to judge the sensor, an EV figure w/o aperture and exposure time is meaningless.

3. According to Sony, it is F1.4, 1/60s exposure. -9 EV then requires ISO 6,000,000 to expose correctly. I.e., the image shown is ISO 6m.

4. That's 3.9 stop beyond e.g., the A7s highest iso level of 410k. But the image quality shown by Sony for a tiny 400x300 pixel image is terrible. While the A7s is still ok at 410k.

Therefore, no conclusion that this chip would be more sensitive than other sensors can be drawn from matrerial provided. Just marketing non info.

And btw, at quantum efficiencies already as high as 65% and read noise as low as 0.4 e- (A7s) rest assured that no miracles are left in this field if you cannot break the laws of nature.

Howaboutraw: howaboutanobelprize?

Direct link | Posted on Oct 22, 2014 at 04:35 UTC

Nice. This is why most of the photographers buy their cameras. While still there are other directions in photography that are making it closer to other arts e.g. painting, but for me personally this way of using the camera is the most exciting: capture the world, nature and people, at the grandeous sites and moments.

Direct link | Posted on Oct 12, 2014 at 21:26 UTC as 44th comment | 1 reply
On Travel tripods: Comparing 5 aluminum kits article (107 comments in total)
In reply to:

Artak Hambarian: Very welcome review, since it tries to make a measurable comparison, finally. I have read also a German article on a similar comparison of Feisol, Manfrotto and Gitzo Tripods through a laser pointer mounted on the tripod. I would like to suggest to share more details, so that anyone could make a similar comparison:
1. Shape of the aluminum block and the way it and the ipad are mounted.
2. data on solenoid hammer - power rating, core weight, voltage, etc.
3. Where exactly the vibration is applied - mm-s from the ground.
4. Name the seismometer app used.
5. Try spikes, extend column, etc. A photograph of the setup is very very welcome.
In fact DPReview can end the "endless" and meaningless increase of the weight rating by manufacturers by setting standards for tests!

Mark, thank you very much for explanation. I wish DPReview leads the standardisation process. I still have questions, e.g. related to the 60lbs valve (! - are you sure? You in fact can easily break Al legs with that weight. Probably that's why column up yields too much of vibration). I am sure next articles will be read with as much or more of interest!

Direct link | Posted on Jul 22, 2014 at 17:56 UTC
On Travel tripods: Comparing 5 aluminum kits article (107 comments in total)

...Certainly another good source of vibration is the slap of the mirror or the shutter vibration. Then no need in solenoid. However, possibly the seismometer app/ipad combo may not have the needed sensitivity. Interesting...

Direct link | Posted on Jul 21, 2014 at 20:36 UTC as 19th comment
On Travel tripods: Comparing 5 aluminum kits article (107 comments in total)

Very welcome review, since it tries to make a measurable comparison, finally. I have read also a German article on a similar comparison of Feisol, Manfrotto and Gitzo Tripods through a laser pointer mounted on the tripod. I would like to suggest to share more details, so that anyone could make a similar comparison:
1. Shape of the aluminum block and the way it and the ipad are mounted.
2. data on solenoid hammer - power rating, core weight, voltage, etc.
3. Where exactly the vibration is applied - mm-s from the ground.
4. Name the seismometer app used.
5. Try spikes, extend column, etc. A photograph of the setup is very very welcome.
In fact DPReview can end the "endless" and meaningless increase of the weight rating by manufacturers by setting standards for tests!

Direct link | Posted on Jul 21, 2014 at 20:26 UTC as 20th comment | 5 replies
On Quick Review: That Steady Thing article (69 comments in total)

Excuse me for multiple posts - I just could not see if the post went through on my Android device. Now I cannot find how to delete my erratic posts...

Direct link | Posted on Jul 11, 2014 at 05:18 UTC as 15th comment
On Quick Review: That Steady Thing article (69 comments in total)

Look at the Novoflex tripod/quadropod solutions - this is the most modular support system. It has similar solutions but more expensive I guess.

Direct link | Posted on Jul 11, 2014 at 04:52 UTC as 16th comment
On Quick Review: That Steady Thing article (69 comments in total)

Look at the Novoflex tripod/quadropod solutions - the most modular support system. It has similar solutions but more expensive I guess.

Direct link | Posted on Jul 11, 2014 at 04:51 UTC as 17th comment
On Quick Review: That Steady Thing article (69 comments in total)

Look at the Novoflex tripod/quadropod solutions - the most modular support system. It has similar solutions but more expensive I guess.

Direct link | Posted on Jul 11, 2014 at 04:50 UTC as 19th comment
On Quick Review: That Steady Thing article (69 comments in total)

Look at the Novoflex tripod/quadropod solutions - the most modular support system. It has similar solutions but more expensive I guess.

Direct link | Posted on Jul 11, 2014 at 04:50 UTC as 20th comment
In reply to:

Markol: I sometimes see people using tablets for taking photos, so I guess that's the connection to this article being posted on the dpr site. Otherwise I would think that it's slowly turning into a tech-blog.

I cannot believe that you watch your or any photos after only printing... or... do you?

Direct link | Posted on Jun 13, 2014 at 21:55 UTC
On Flashpoint Budget Studio Monolight Review article (42 comments in total)
In reply to:

michael_alabama: 300 "Ws" and 160 "Ws" is not sigificantly longer to write than "W". "Ws" is the energy of the Flash. The Power "W" is much higher than 300 W. Why not write the correct dimension? You can take it from the Adorama description. Perhaps they have the time to write the longish dimension?

Correct. But the Ws is the convention.

Direct link | Posted on Jun 7, 2014 at 05:04 UTC
On Leica M Monochrom now available in grayscale (sort of) article (137 comments in total)
In reply to:

RichRMA: Be nice if DPreview tested one of these, I'd like to see how a monochrome sensor presents noise.

...just the same as any other recent dslr - maybe x.xx% better, not more than 10%...

Direct link | Posted on May 27, 2014 at 22:36 UTC
On Light Field Cameras - Focusing on the Future article (135 comments in total)

Nice! In the future, no doubt only this type of cameras shall survive - if you do not believe, look even into further future - plain cameras shall be used only for a few special cases. However I will wait for its Foveon type a realisation and @ 36MP or higher resolution I hope it will not take too many decades!

Direct link | Posted on May 16, 2014 at 22:49 UTC as 26th comment
On Journey to the center of the Earth with Robbie Shone article (49 comments in total)
In reply to:

Valiant Thor: Colorful but highly exaggerated title. The deepest men have ventured into the earth is around 2.4 miles which would be 0.00057 % to the center. It may be a while before someone claims that prize.

...without the percent sign...

Direct link | Posted on May 11, 2014 at 19:35 UTC
On ThinkTank Streetwalker HardDrive Backpack Review article (82 comments in total)
In reply to:

Mario G: A backpack called "HardDrive"? What a stupid name.

Harddrive=you can drive it hard.

Direct link | Posted on Apr 25, 2014 at 22:02 UTC
On ThinkTank Streetwalker HardDrive Backpack Review article (82 comments in total)
In reply to:

Artak Hambarian: While have not used this bag, one drawback is evident: you need to put it on the ground - read mud, water, steep slope, ice - to change a lens. The art of bag making still needs to say its word in combining comfort, performance, speed and versatility, in my opinion...

I mean its better not to put anywhere, especially when there is no place to put. This is why my bag for the last few years is the Lowepro Flipside 400. however its just a ted bit smaller than I need. There a bigger one too but I yet do not hurry with it. The Flipside series allows turning the backpack to your front and work with it without putting on the ground. The 400 is not without drawbacks either, but so far has been the best for me when climbing the glaciers.

Direct link | Posted on Apr 25, 2014 at 21:55 UTC
On ThinkTank Streetwalker HardDrive Backpack Review article (82 comments in total)

While have not used this bag, one drawback is evident: you need to put it on the ground - read mud, water, steep slope, ice - to change a lens. The art of bag making still needs to say its word in combining comfort, performance, speed and versatility, in my opinion...

Direct link | Posted on Apr 25, 2014 at 19:31 UTC as 33rd comment | 6 replies
Total: 60, showing: 1 – 20
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